DOI is not strictly required to publish a research paper, but it is highly recommended. Basically, the International Scientific Journal of Engineering and Management (ISJEM) provides a FREE DOI for research papers that are published.

Many publishers and journals require that papers submitted for publication have a DOI assigned to them. This is because a DOI provides a permanent and unique identifier for the paper, making it easy to locate and access even if the original URL changes. Additionally, many publishers and journals use DOI for tracking and reporting on usage statistics, which can provide valuable information about the reach and impact of scholarly content.

Digital Object Identifiers (DOIs) are unique alphanumeric strings that are assigned to digital objects, such as research papers, to provide a persistent and unique link to the paper, even if the original URL changes. While it is not strictly required to have a DOI assigned to a research paper in order to publish it, it is highly recommended for several reasons.

First, many publishers and journals require that papers submitted for publication have a DOI assigned to them. This is because a DOI provides a permanent and unique identifier for the paper, making it easy to locate and access even if the original URL changes. Additionally, many publishers and journals use DOI for tracking and reporting on usage statistics, which can provide valuable information about the reach and impact of scholarly content.

Second, having a DOI can make it easier for researchers to find your paper. Many databases and search engines, such as Google Scholar, use DOI as the primary way to identify and link to scholarly articles. This means that if your paper has a DOI, it is more likely to show up in search results and be accessed by researchers in your field.

Third, it is an important aspect of academic integrity and scholarly publishing, it ensures that the paper is original and not plagiarized, it also ensures that proper attribution and citation are used throughout the paper.

In conclusion, while it is not strictly required to have a DOI assigned to a research paper in order to publish it, it is highly recommended for several reasons such as making it easy to locate and access your paper, tracking and reporting of the usage statistics of your paper, and being an important aspect of academic integrity and scholarly publishing.